Just used what I believe was my last reroll to make a mentat addicted sniper, as having 9 natural perception left me unable to max luck, so instead, being able to compensate my now 7 pe with mentats (+3 pe) or bloodmoon (+2 pe) (if I can ever manage to find scorpion eggs) instead leaves me a much more effective sniper.
It cost me 2 perks to do this effectively; replacing critical strength and Dr Strangelove with toughness and adrenaline rush in an attempt to negate the downsides of mentats, but now I have the option of not taking mentats and being a tough close range gunner too (especially if I use psycho).
I changed my build because mentats were useless to me (didn't increase my sight range enough to be useful). But I seem to have created a much more flexible character in the meantime.
I don't really know if it is all for the best or not yet, but so far, I like this character a lot more.